Method and apparatus for locating pipeline damage

Details Method and apparatus for locating pipeline damage Method and apparatus for locating pipeline damage

1982-03-31

1984-07-03

Swisher, S. Clement

Measuring and testing

With fluid pressure

Leakage

G01M 324

Patent

active

044571631

ABSTRACT:
Apparatus and method are provided for the location of pipeline damage and medium leak therefrom by acoustical monitoring of the soil about a pipe and recording emission noise by microphone and an amplifier which controls a peak noise indicator. Each measurement point detected by the amplifier is applied to a digital memory to display a histogram showing noise distribution along the pipe. The main frequency of the loudest measurement point is determined, and an octave filter is utilized to determine the frequency characterizing medium leakage to precisely locate the pipeline damage. Bar diagrams may be provided on a viewplate by bands of parallel arrays of light emitting diodes to display noise distribution along the pipeline. A frequency analyzer may transmit from the amplifier to the memory the peak frequency value of each observed frequency band to enable frequency analysis of the loudest measurement point. The apparatus may have a case with a lid defining openings sized for viewing the bar diagrams.

REFERENCES:
patent: 3200899 (1965-08-01), Krauss
patent: 3626750 (1971-12-01), Talmon
Sabo, "Detect buried steam leak with acoustics", 7/1976.
Hewlett-Packard Journal, 5/1967.

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